Ecclesiastes 2:21-23

21For there is a man whose labour is in wisdom, and in knowledge, and in equity; yet to a man that hath not laboured in it shall he leave it for his portion. This also is vanity and a great evil.1 22For what hath man of all his labour, and of the vexation of his heart, in which he hath laboured under the sun? 23For all his days are sorrows, and his labour grief; yea, his heart taketh not rest in the night. This is also vanity.